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Optimization of production well patterns for natural gas hydrate reservoir: Referring to the results from production tests and numerical simulations

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China Geology 2025年第1期8卷 39-57页

作者： Lang-feng Mu Hao-tian Liu Chi Zhang Yi Zhang Hai-long Lu School of Earth and Space Sciences Peking UniversityBeijing 100871China Beijing International center for gas Hydrate School of Earth and Space SciencesPeking UniversityBeijing 100871China Chinese Academy of Geological Sciences China Geological SurveyMinistry of Natural Resources Beijing 100037China College of Engineering Peking UniversityBeijing 100871China national Engineering research center of Natural gas Hydrate Exploration and development Guangzhou 511458China China national oil and gas Exploration and development LTD Corporation Petro-ChinaBeijing 100034China

Natural gas hydrate is a clean energy source with substantial resource *** contrast to conventional oil and gas,natural gas hydrate exists as a multi-phase system consisting of solids,liquids,and gases,which presents unique challenges and complicates the mechanisms of seepage and *** domestic and international natural gas hydrate production tests typically employ a single-well production *** this approach has seen some success,it continues to be hindered by low production rates and short production ***,there is an urgent need to explore a new well network to significantly increase the production of a single *** paper provides a comprehensive review of the latest advancements in natural gas hydrate research,including both laboratory studies and field *** further examines the gas production processes and development outcomes for single wells,dual wells,multi-branch wells,and multi-well systems under conditions of depressurization,thermal injection,and CO_(2) *** this basis,well types and well networks suitable for commercial exploitation of natural gas hydrate were explored,and the technical direction of natural gas hydrate development was *** study shows that fully exploiting the flexibility of complex structural wells and designing a well network compatible with the reservoir is the key to improving production from a single ***,multi-well joint exploitation is identified as an effective strategy for achieving large-scale,efficient development of natural gas hydrate.

关键词： gas Hydrate Production Depressurization Heat Injection Replacement Multi-Branch Well Well patterns Hydrate exploration engineering

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Study on the Fluid-Solid Coupling Seepage of the Deep tight Reservoir Based on 3D Digital Core Modeling

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energy Engineering 2025年第2期122卷 537-560页

作者： Haijun Yang Zhenzhong Cai Hui Zhang Chong Sun Jing Li Xiaoyu Meng Chen Liu Chengqiang Yang PetroChina Tarim oilfield Company Korla841000China CNPC R&D center for Ultra-Deep Complex Reservoir Exploration and development Korla841000China national Key Laboratory of Deep oil and gas China University of Petroleum(East China)Qingdao266580China Structure and Shipping Department Offshore Oil Engineering(Qingdao)Co.Ltd.Qingdao266520China

Deep tight reservoirs exhibit complex stress and seepage fields due to varying pore structures,thus the seepage characteristics are significant for enhancing oil *** study conducted triaxial compression and permeability tests to investigate the mechanical and seepage properties of tight sandstone.A digital core of tight sandstone was built using Computed Tomography(CT)scanning,which was divided into matrix and pore phases by a pore equivalent diameter threshold.A fluid-solid coupling model was established to investigate the seepage characteristics at *** results showed that increasing the confining pressure decreased porosity,permeability,and flow velocity,with the pore phase becoming the dominant seepage *** and large pores closed first under increasing pressure,resulted in a steep drop in ***,permeability slightly decreased under high confining pressure,which followed a first-order exponential *** velocity increased with seepage *** the damage mainly occurred in stress-concentration regions under low seepage *** behavior followed linear Darcy flow,the damage emerged at seepage entrances under high pressure,which decreased rock elastic modulus and significantly increased permeability.

关键词： Digital core fluid-solid coupling pore structure microscopic seepage

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The petrological characteristics and signif icance of organic-rich shale in the Chang 7 member of the Yanchang Formation,south margin of the Ordos basin,central China

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Petroleum Science 2019年第6期16卷 1255-1269页

作者： Sen Li Ru-Kai Zhu Jing-Wei Cui Zhong Luo Jing-Gang Cui Han Liu Wei-Qiang Li research Institute of Petroleum Exploration and development Beijing 100083China tight oil and gas research center of national energy Beijing 100083China Key Lab of oil and gas Reservoir of PetroChina Beijing 100083China

The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos *** sedimentary environment and the controlling factors of organic matter enrichment,however,are still in *** this investigation,the Yishicun outcrop,located on the south margin of the Ordos basin,has been considered for the study.X-ray diffraction,polarizing microscopy,field emission scanning electron microscopy and cathodoluminescence(CL)were used to investigate the petrological features of the organic-rich *** content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level,ash content and the enrichment of organic *** has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon,demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic ***,with an increase in the ash content,the content of organic matter increased at first and then decreased,and reached a maximum when the ash content was about 6%,illustrating that the ash input has a double effect on the enrichment of organic matter.

关键词： Organic-rich shale Volcanic ash Framboidal pyrite pseudocrystal Chang 7 member Ordos basin

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Reservoir and development characteristics of the Da'anzhai tight oil in Sichuan Basin,SW China

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Petroleum research 2019年第3期4卷 212-226页

作者： Yongjun Wang Min Tong Yuanhui Sun Yuanzhong Zhang Dawei Yuan PetroChina research Institute of Petroleum Exploration and development Beijing100083China national energy tight oil and gas research&development center Beijing100083China College of Geophysics and Information Engineering China University of PetroleumBeijing102249China

The oil in the Jurassic Da'anzhai reservoirs in the Sichuan Basin is unconventional tight oil,which accumulated in or near source rocks,and did not experience extensive migration in a large-scale long *** first submember,second submember and third submember of Da'anzhai Member are dominated by shell limestone which is widely and continuously distributed,and are typical near-source lacustrine shell limestone tight *** lithology,multiple types of reservoir space and complicated pore structure are developed in these *** effective reservoir space mainly includes micro-pores and micro-fractures with strong fabric *** petrophysics experiment reveals that the average connected matrix porosity of tight oil reservoir in Jurassic Da'anzhai Member is about 2.13%,lower than that of other tight oil reservoirs but higher than the average effective porosity(0.97%)from previous single alcohol-saturated *** to production performance data,the Da'anzhai shell limestone reservoir is not a simple porous or fractured reservoir,but has complex porethroat-fracture association or storage-seepage *** the development of fossil shells controls the development of micro-fractures,fluids are difficult to enter into but easy to escape from the *** the pore-throat is fine,the sorting is poor and the displacement pressure is high,the movable fluid saturation and mercury ejection efficiency of the reservoir in the Da'anzhai Member is only slightly lower than that of some storage-seepage modes,and higher than that of oil-bearing Group 7 of Yanchang Formation in the Ordos *** reservoir in the Da'anzhai Member is one of the few tight oil reservoirs with high natural *** tight oil in the shell limestone of the Da'anzhai Member has great development potential,but its extensive and effective development also has some challenges,such as high seepage resistance of matrix and ineffective single development

关键词： tight oil Storage space type Pore structure Pore throat Effective porosity Movable fluid saturation development potential Effective development mode Shell limestone Da'anzhai member Sichuan basin

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Controlling Factors on Organic Matter Accumulation of Marine Shale across the Ordovician–Silurian Transition in South China: Constraints from Trace-Element Geochemistry

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Journal of Earth Science 2021年第4期32卷 887-900页

作者： Zhen Qiu Huifei Tao Bin Lu Zhenhong Chen Songtao Wu Hanlin Liu Junli Qiu research Institute of Petroleum Exploration and development CNPCBeijing 100083China national energy Shale gas research and development(Experiment)center Langfang 065007China oil and gas research center Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of oil and gas Reservoirs CNPCBeijing 100083China national energy tight oil and gas R&D center Beijing 100083China Institute of oil and gas Peking UniversityBeijing 100871China

In recent years,significant progress in shale gas exploration has been achieved in the Upper Ordovician(Wufeng Formation)–Lower Silurian(Longmaxi Formation)shales in the Upper Yangtze area,South *** many studies have been carried out on the Upper Ordovician–Lower Silurian shales,the controlling factors causing organic matter accumulation of these shales remain *** study uses trace-element geochemistry and sedimentological methods to evaluate terrigenous input,redox conditions and primary productivity to explore the mechanisms of organic matter *** variation of terrigenous fraction elements(Al,Th and Sc)concentrations reflect a mixed influence of sea-level change and *** sea-level of the Upper Yangtze Sea went through two cycles of transgression to regression during the Ordovician–Silurian *** Linxiang Formation,Kuanyinchiao Bed and the upper part of Longmaxi Formation developed during the periods of regression,whereas the Wufeng Formation and the lower part of the Longmaxi Formation developed during the periods of *** paleo-productivity indexes of TOC content,ratios of Ba/Al and P/Al,and redox conditions proxies of Mo concentration,ratios of U/Th and V/Cr generally display similar variation patterns with respect to the sea-level *** TOC contents and Ba/Al and P/Al ratios indicate the paleo-productivity was high on the sea surface,as shown by relatively good positive correlations between Th ***,and Sc *** indicates that the paleo-productivity was controlled by the nutrients input through *** good positive correlations between redox conditions indexes(U/Th and V/Cr ratios)with TOC content reflects reductive preservation conditions(anoxic to euxinic),thus implying they were an important controlling factor for organic matter ***,redox conditions were closely associated with sea level change and organic matter ***,the sea-lev

关键词： productivity redox sea-level change shale gas Sichuan Basin Wufeng-Longmaxi shale

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Reliability analysis of marine risers with narrow and long corrosion defects under combined loads

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Petroleum Science 2014年第1期11卷 139-146页

作者： Hu Xianwei Zhou Canfeng Duan Menglan An Chen Offshore oil and gas research center China University of Petroleum China national oil & gas Exploration and development Corporation research center of energy Engineering Advanced Joining Technology Beijing Institute of Petrochemical Technology

A marine riser,one of the most important components of offshore oil/gas transportation,needs to be designed to eliminate the risks caused by complex ocean environments,platform displacement and internal corrosion,*** this study,a new analytical-numerical assessment approach is proposed in order to quantitatively investigate the reliability of internally corroded risers under combined loads including axial tension and internal ***,an analytical solution of the limit state function of intact risers under combined loads is obtained,which is further modified by the non-dimensional corrosion depth （d/ t） for the risers with a narrow and long corrosion *** relationship between d/t and limited internal pressure is obtained by finite element analysis and nonlinear *** an advanced first-order reliability method （HL-RF） algorithm,reliability analysis is performed to obtain the failure probability,the reliability index and the *** results are further verified by Monte-Carlo importance *** proposed approach of reliability analysis provides an accurate and effective way to estimate the reliability of marine risers with narrow and long corrosion defects under combined loads.

关键词： Marine riser corrosion defect combined loads reliability calculation reliability verification

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Characteristics of Diagenesis and Pore Evolution of Volcanic Reservoir: A Case Study of Junggar Basin, Northwest China

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Journal of Earth Science 2021年第4期32卷 960-971页

作者： Zhiguo Mao Rukai Zhu Jinghong Wang Jinglan Luo Ling Su research Institute of Petroleum Exploration and development PetroChinaBeijing 100083China national energy tight oil and gas R&D center Beijing 100083China Key Laboratory of oil and gas Reservoirs CNPCBeijing 100083China State Key Laboratory of Continental Dynamics Northwest UniversityXi’an 710069China

Unconventional volcanic reservoir is different from conventional reservoir in reservoir space,diagenesis,pore formation and *** Carboniferous volcanic reservoir was selected in Junggar Basin,Northwest China because based on sediment/rock cores and outcrop data,diagenesis and pore evolution were studied by elemental measurements,thin section observations,and diagenetic *** analyses shows that the reservoir lithology is predominantly intermediate-basic volcanic,and the reservoir storage space is composed mainly of secondary dissolved pores and *** reservoir displays great heterogeneity,and has experienced a great variety of diagenetic alteration during various diagenetic stages including:(1)eruption fragmentation,crystallization differentiation and condensing consolidation at consolidated diagenetic stage;(2)metasomatic alteration,filling,weathering and leaching,dissolution by formation fluids and tectonism at the epigenetic modifications *** formation and evolutionary process of the pores is extremely *** primary pores were formed during the consolidated diagenetic stage,and laid a foundation for the late development and alteration of effective *** the epigenetic modifications stage secondary reservoir storage space was developed via the formation of secondary pores and the development of fractures through weathering and leaching,dissolution by formation fluids and tectonism.

关键词： volcanic reservoir diagenesis Carboniferous Junggar Basin

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Organic matter occurrence and pore-forming mechanisms in lacustrine shales in China

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Petroleum Science 2022年第4期19卷 1460-1472页

作者： Li-Chun Kuang Lian-Hua Hou Song-Tao Wu Jing-Wei Cui Hua Tian Li-Jun Zhang Zhong-Ying Zhao Xia Luo Xiao-Hua Jiang Science and Technology R&D Department CNPCBeijing100000China research Institute of Petroleum Exploration and development CNPCBeijing100083China national energy tight oil and gas R&D center Beijing100083China Key Laboratory of oil and gas Reservoirs CNPCBeijing100083China

The evolution of pore structure in shales is affected by both the thermal evolution of organic matter(OM)and by inorganic diagenesis,resulting in a wide variety of pore *** paper examines the OM distribution in lacustrine shales and its influence on pore structure,and describes the process of porosity *** principal findings are:(i)Three distribution patterns of OM in lacustrine shales are distinguished;laminated continuous distribution,clumped distribution,and stellate scattered *** differences in total organic carbon(TOC)content,free hydrocarbon content(S_(1)),and OM porosity among these distribution patterns are discussed.(ii)Porosity is negatively correlated with TOC and plagioclase content and positively correlated with quartz,dolomite,and clay mineral content.(iii)Pore evolution in lacustrine shales is characterized by a sequence of decreasing-increasing-decreasing porosity,followed by continuously increasing porosity until a relatively stable condition is reached.(iv)A new model for evaluating porosity in lacustrine shales is *** this model,the organic and inorganic porosity of shales in the Permian Lucaogou Formation are calculated to be 2.5%-5%and 1%-6.3%,respectively,which correlate closely with measured *** findings may provide a scientific basis and technical support for the sweet spotting in lacustrine shales in China.

关键词： Shale oil Unconventional oil and gas Organic matter Pore evolution Log interpretation model

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The Water Flooding Seepage Mechanism in the Inter-Fractures of Horizontal Wells in tight oil Reservoirs

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Fluid Dynamics & Materials Processing 2025年第2期21卷 427-444页

作者： Xinli Zhao Qianhua Xiao Xuewei Liu Yu Shi Xiangji Dou Guoqiang Xing School of Petroleum and Natural gas Engineering Changzhou UniversityChangzhou213164China School of oil and gas Engineering Chongqing University of Science&TechnologyChongqing401331China research Institute of Petroleum Exploration&development PetroChina Company LimitedBeijing100083China College of Petroleum Engineering Xi’an Shiyou UniversityXi’an710065China

tight oil reservoirs face significant challenges,including rapid production decline,low recovery rates,and a lack of effective energy replenishment *** this study,a novel development model is proposed,based on inter-fracture injection following volumetric fracturing and relying on a high-temperature and high-pressure large-scale physical simulation ***,the CMG(Computer Modelling Group Ltd.,Calgary City,Canada)software is also used to elucidate the impact of various single factors on the production of horizontal wells while filtering out the interference of *** effects of fracture spacing,fracture half-length,and the injection-production ratio are *** indicate that under rejection pressures of 6.89,3.45,and 1.88 MPa,the times to establish stable flow are 50,193,and 395 min,*** injection pressures lead to an increased oil recovery efficiency,with the highest observed efficiency at 16.93%.This indicates that,compared with conventional medium and high permeability reservoirs,tight oil reservoirs exhibit similar pore throats and larger capillary forces when oil and water flow in both *** pressures reduce capillary forces,displacing more oil droplets,thus enhancing oil recovery ***,under inter-fracture displacement conditions,the pressure gradient at both the injection and production ends remain consistent,with minimal pressure loss near the *** feature ensures that the crude oil in the middle of the reservoir also possesses displacement energy,thereby enhancing overall crude oil displacement efficiency.

关键词： tight oil reservoir volumetric fracturing inter-fracture injection and production oil drive efficiency waterflooding

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Conglomerate Reservoir Pore Evolution Characteristics and Favorable Area Prediction: A Case Study of the Lower Triassic Baikouquan Formation in the Northwest Margin of the Junggar Basin, China

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Journal of Earth Science 2021年第4期32卷 998-1010页

作者： Meng Xiao Songtao Wu Xuanjun Yuan Zongrui Xie Petroleum Exploration&Production research Institute SINOPECBeijing 100083China research Institute of Petroleum Exploration and development CNPCBeijing 100083China Key Laboratory of oil and gas Reservoirs CNPCBeijing 100083China national energy tight oil and gas R&D center Beijing 100083China research Institute of Exploration and development Xinjiang Oilfield CompanyPetroChinaKaramay 834000China

This study examines the characteristics and pore evolution of the Baikouquan conglomerate reservoir in the Mahu sag of the Junggar Basin from original sedimentation and *** is based on core observation,thin section,X-ray diffraction,cathodoluminescence and image analysis,and combined with physical property and well log *** results show that conglomerate reservoir in the Baikouquan Formation can be divided into three lithofacies types:TypeⅠis argillaceous filling conglomerate facies,in which cementation and dissolution are not developed,and the interstitial material is mainly argillaceous;TypeⅡis tuffaceous filling in fine conglomerate facies,in which volcanic rock debris,illite and dissolution are developed;TypeⅢis sandstone filling conglomerate facies,in which cementation and dissolution are *** reservoir undergoes complex diagenesis,and the diagenetic sequence is:compaction→early chlorite film→early calcite cementation→detritus,feldspar and tuffaceous dissolution→quartz secondary enlargement→late calcite cementation→oil invasion→forming *** study of pore evolution shows that dissolution and calcite cementation are relatively developed in lithofacies Type III,and that compaction has a great influence on lithofacies TypeⅠand *** to comprehensive evaluation of lithofacies,diagenesis and pore structure characteristics,the reservoir space type is mainly the dissolution *** is mainly primarily mainly composed of lithofacies Type III,thickness of the gravel body is more than 25 m,porosity is generally more than 12%,which represents favorable conditions for the distribution of favorable reservoir.

关键词： conglomerate reservoir lithofacies pore evolution favorable reservoir Junggar Basin

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